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Journal Articles

Recent improvements of the Particle and Heavy Ion Transport code System; PHITS version 3.33

Sato, Tatsuhiko; Iwamoto, Yosuke; Hashimoto, Shintaro; Ogawa, Tatsuhiko; Furuta, Takuya; Abe, Shinichiro; Kai, Takeshi; Matsuya, Yusuke; Matsuda, Norihiro; Hirata, Yuho; et al.

Journal of Nuclear Science and Technology, 9 Pages, 2023/00

The Particle and Heavy Ion Transport code System (PHITS) is a general-purpose Monte Carlo radiation transport code that can simulate the behavior of most particle species with energies up to 1 TeV (per nucleon for ions). Its new version, PHITS3.31, was recently developed and released to the public. In the new version, the compatibility with high-energy nuclear data libraries and the algorithm of the track-structure modes have been improved. In this paper, we summarize the upgraded features of PHITS3.31 with respect to the physics models, utility functions, and application software introduced since the release of PHITS3.02 in 2017.

Journal Articles

Tough yet flexible superelastic alloys meet biomedical needs

Xu, X.*; Odaira, Takumi*; Xu, S.*; Hirata, Kenji*; Omori, Toshihiro*; Ueki, Kosuke*; Ueda, Kyosuke*; Narushima, Takayuki*; Nagasako, Makoto*; Kainuma, Ryosuke*; et al.

Advanced Materials & Processes, 180(7), p.35 - 37, 2022/10

Journal Articles

Flexible and tough superelastic Co-Cr alloys for biomedical applications

Odaira, Takumi*; Xu, S.*; Hirata, Kenji*; Xu, X.*; Omori, Toshihiro*; Ueki, Kosuke*; Ueda, Kyosuke*; Narushima, Takayuki*; Nagasako, Makoto*; Harjo, S.; et al.

Advanced Materials, 34(27), p.2202305_1 - 2202305_11, 2022/07

 Times Cited Count:3 Percentile:85.34(Chemistry, Multidisciplinary)

Journal Articles

Features of accelerator-based neutron source for boron neutron capture therapy calculated by Particle and Heavy Ion Transport code System (PHITS)

Matsuya, Yusuke; Kusumoto, Tamon*; Yachi, Yoshie*; Hirata, Yuho; Miwa, Misako*; Ishikawa, Masayori*; Date, Hiroyuki*; Iwamoto, Yosuke; Matsuyama, Shigeo*; Fukunaga, Hisanori*

AIP Advances (Internet), 12(2), p.025013_1 - 025013_9, 2022/02

 Times Cited Count:2 Percentile:51.2(Nanoscience & Nanotechnology)

Boron Neutron Capture Therapy (BNCT) is a radiation therapy, which can selectively eradicate solid tumors by $$alpha$$-particles and Li ions generated through the nuclear reaction between thermal neutron and $$^{10}$$B in tumor cells. With the development of accelerator-based neutron sources that can be installed in medical institutions, accelerator-based boron neutron capture therapy is expected to become available at several medical institutes around the world in the near future. Lithium is one of the targets that can produce thermal neutrons from the $$^{7}$$Li(p,n)$$^{7}$$Be near-threshold reaction. Particle and Heavy Ion Transport code System (PHITS) is a general-purpose Monte Carlo code, which can simulate a variety of diverse particle types and nuclear reactions. The latest PHITS code enables simulating the generation of neutrons from the $$^{7}$$Li(p,n)$$^{7}$$Be reactions by using Japanese Evaluated Nuclear Data Library (JENDL-4.0/HE). In this study, we evaluated the neutron fluence using the PHITS code by comparing it to reference data. The subsequent neutron transport simulations were also performed to evaluate the boron trifluoride (BF$$_{3}$$) detector responses and the recoiled proton fluence detected by a CR-39 plastic detector. As a result, these comparative studies confirmed that the PHITS code can accurately simulate neutrons generated from an accelerator using a Li target. The PHITS code has a significant potential for contributing to more precise evaluating accelerator-based neutron fields and understandings of therapeutic effects of BNCT.

Journal Articles

Progress of divertor simulation research toward the realization of detached plasma using a large tandem mirror device

Nakashima, Yosuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Oki, Kensuke*; Sakamoto, Mizuki*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; Imai, Tsuyoshi*; et al.

Journal of Nuclear Materials, 463, p.537 - 540, 2015/08

 Times Cited Count:18 Percentile:82.74(Materials Science, Multidisciplinary)

Journal Articles

Development of divertor simulation research in the GAMMA 10/PDX tandem mirror

Nakashima, Yosuke*; Sakamoto, Mizuki*; Yoshikawa, Masayuki*; Oki, Kensuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; et al.

Proceedings of 25th IAEA Fusion Energy Conference (FEC 2014) (CD-ROM), 8 Pages, 2014/10

Journal Articles

Innovative alpha radioactivity monitor for clearance level inspection based on ionized air transport technology; CFD-simulated and experimental ion transport efficiencies for uranium-attached pipes

Hirata, Yosuke*; Nakahara, Katsuhiko*; Sano, Akira*; Sato, Mitsuyoshi*; Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*

Journal of Power and Energy Systems (Internet), 2(2), p.561 - 572, 2008/00

Journal Articles

Innovative alpha radioactivity monitor for clearance level inspection based on ionized air transport technology, 2; CFD-simulated and experimental ion transport efficiencies for uranium-attached pipes

Hirata, Yosuke*; Nakahara, Katsuhiko*; Sano, Akira*; Sato, Mitsuyoshi*; Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*

Proceedings of 15th International Conference on Nuclear Engineering (ICONE-15) (CD-ROM), 6 Pages, 2007/04

no abstracts in English

Journal Articles

Ion current prediction model considering columnar recombination in alpha radioactivity measurement using ionized air transportation

Naito, Susumu*; Hirata, Yosuke*; Izumi, Mikio*; Sano, Akira*; Miyamoto, Yasuaki; Aoyama, Yoshio; Yamaguchi, Hiromi

Journal of Nuclear Science and Technology, 44(2), p.121 - 128, 2007/02

 Times Cited Count:1 Percentile:11.35(Nuclear Science & Technology)

A reinforced ion current prediction model in the alpha radioactivity measurement using ionized air transportation was presented. Although our previous model explained a qualitative trend of the measured ion current values, their absolute values were considerably overestimated. In order to explain them quantitatively, the model was reinforced in consideration of columnar recombination. It was found that our new model explains the considerable ion loss in the initial stage of ion diffusion and narrows the gap between the predicted and measured ion current values. This model also indicated a prospective suppression of ion loss due to columnar recombination by spraying a high-speed air flow on the contaminated surface. This suppression was experimentally investigated and confirmed. In conclusion, the theoretical relationship between alpha radioactivity and ion current was clarified quantitatively in laminar flow and turbulent pipe flow.

Journal Articles

Particle modeling of transport of $$alpha$$-ray generated ion clusters in air

Tong, L.*; Nambu, Kenichi*; Hirata, Yosuke*; Izumi, Mikio*; Miyamoto, Yasuaki; Yamaguchi, Hiromi

Japanese Journal of Applied Physics, Part 1, 45(10B), p.8217 - 8220, 2006/10

 Times Cited Count:0 Percentile:0(Physics, Applied)

A particle model is developed using the test-particle Monte Carlo method to study the transport properties of alpha-ray generated ion clusters in a flow of air. The simulated transport properties provide a theoretical basis for designing the alpha radioactivity measurement system. An accurate ion-molecule collision model is proposed to simulate the collisions between ion and air molecule. The recombination between positive and negative ions is simulated using Nanu and Denpoh method [J. Phys. Soc. Jpn. 67(1998) 1288]. The calculations are performed from low gas pressures of 0.001 and 0.01 atm to high gas pressures of 0.1 and 1 atm in a circular pipe. The simulation presents such a steady state ion transport that the generation of ions reaches a quasi-equilibrium with the loss of ions, absorbed by a measuring sensor and lost on the pipe wall.

Journal Articles

Simultaneous measurements of ion and electron currents using a novel compact electrostatic end-loss-current detector

Hirata, Mafumi*; Miyake, Yasuhiro*; Chujo, T.*; Kohagura, Junko*; Numakura, Tomoharu*; Shimizu, Kiyoaki*; Ito, Marie*; Kiminami, Serina*; Morimoto, Naomichi*; Hirai, Katsuaki*; et al.

Review of Scientific Instruments, 77(10), p.10E719_1 - 10E719_3, 2006/10

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

The Design of a tapered dimple-type mode converter/launcher for high-power gyrotrons

Hirata, Yosuke*; Mitsunaka, Yoshika*; Hayashi, Kenichi*; Ito, Yasuyuki*; Sakamoto, Keishi; Imai, Tsuyoshi

IEEE Transactions on Plasma Science, 31(1), p.142 - 145, 2003/02

 Times Cited Count:11 Percentile:34.37(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Development of 170GHz high power gyrotron and transmission line for ECH in JAERI

Sakamoto, Keishi; Kasugai, Atsushi; Tsuneoka, Masaki; ; Imai, Tsuyoshi; *; Hayashi, Kenichi*; Mitsunaka, Yoshika*; Hirata, Yosuke*; *; et al.

Proceedings of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 1, p.441 - 444, 1998/00

no abstracts in English

Journal Articles

Development of high power 170GHz gyrotron for ITER

Sakamoto, Keishi; Kasugai, Atsushi; Tsuneoka, Masaki; Takahashi, Koji; ; Imai, Tsuyoshi; *; Hayashi, Kenichi*; Mitsunaka, Yoshika*; Hirata, Yosuke*; et al.

22nd International Conference on Infrared and Millimeter Waves Conference Digest, p.106 - 107, 1997/00

no abstracts in English

Journal Articles

Cold test of gyrotron output ware-beam splitter and combiner

Mitsunaka, Yoshika*; Hirata, Yosuke*; Hayashi, Kenichi*; Ito, Yasuyuki*; Sakamoto, Keishi; Kasugai, Atsushi; Takahashi, Koji; Imai, Tsuyoshi

22nd International Conference on Infrared and Millimeter Waves Conference Digest, p.19 - 20, 1997/00

no abstracts in English

Journal Articles

Development of 170GHz long pulse gyrotron with depressed collector

Kasugai, Atsushi; Sakamoto, Keishi; Tsuneoka, Masaki; Takahashi, Koji; Maebara, Sunao; Imai, Tsuyoshi; Kariya, Tsuyoshi*; Hayashi, Kenichi*; Mitsunaka, Yoshika*; Hirata, Yosuke*

Fusion Technology 1996, 1, p.549 - 552, 1996/00

no abstracts in English

Journal Articles

Development of high efficiency gyrotron with depressed collector for ECH system

Sakamoto, Keishi; Tsuneoka, Masaki; Kasugai, Atsushi; Takahashi, Koji; Imai, Tsuyoshi; Kariya, Tsuyoshi*; Hayashi, Kenichi*; Mitsunaka, Yoshika*; Hirata, Yosuke*

Purazuma, Kaku Yugo Gakkai-Shi, 71(10), p.1029 - 1037, 1995/10

no abstracts in English

Journal Articles

Development of high power gyrotron with energy recovery system

Sakamoto, Keishi; Tsuneoka, Masaki; Kasugai, Atsushi; Takahashi, Koji; Maebara, Sunao; Imai, Tsuyoshi; Kariya, Tsuyoshi*; *; Hayashi, Kenichi*; Mitsunaka, Yoshika*; et al.

Fusion Technology 1994, 0, p.501 - 504, 1995/00

no abstracts in English

Journal Articles

Developmet of a high power and long pulse gyrotron with collector potential depression

Kasugai, Atsushi; Sakamoto, Keishi; Tsuneoka, Masaki; Takahashi, Koji; Maebara, Sunao; Imai, Tsuyoshi; Kariya, Tsuyoshi*; *; Hayashi, Kenichi*; Mitsunaka, Yoshika*; et al.

Int. Electron Devices Meeting 1994, 0, p.9.1.1 - 9.1.4, 1994/00

no abstracts in English

Journal Articles

Development of a high power gyrotron for ECH of tokamak plasma

Sakamoto, Keishi; Tsuneoka, Masaki; Maebara, Sunao; Kasugai, Atsushi; Fujita, Hideo*; *; Yamamoto, Takumi; Nagashima, Takashi; Kariya, Tsuyoshi*; *; et al.

Proceedings of the 17th International Conference on Infrared and Millimeter Waves, p.188 - 189, 1992/00

no abstracts in English

27 (Records 1-20 displayed on this page)